During this week, the French doctors in the case of radiation overdose were convicted and I was surprised to read that between 2001 and 2006, at least 400 patients underwent about 8% more radiation than the safer dose. This was mainly because radiation dose in radiological exams prior to treatment was not taken into account. I always thought that medical professionals were aware that several medical imaging exams expose the patient to radiation dose. An extra mechanism for signaling was developed in France after this case.
Aunt Minnie article:
http://www.auntminnieeurope.com/index.aspx?sec=nws&sub=rad&pag=dis&ItemID=607680&wf=1
Guardian U.K. article:
http://www.guardian.co.uk/world/2012/sep/24/french-doctors-trial-cancer-overdose
A quick internet tool gives you radiation dose of typical exams: http://www.xrayrisk.com/calculator/calculator-normal-studies.php
For imaging professionals, there is more information on radiation dose:
http://www.imagewisely.org/
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